Check this on Stackoverflow. It looks like it may work for you.

https://stackoverflow.com/...jquery-or-javascript

I'm guessing in your case one of them would look like this. You can try this in the body section in admin / settings / page settings. I add the /* to make sure the script doesn't work here. There are several examples like this on this web telling how to add an attribute to a url.

/*
<script>
$('.base_main_menu a').attr('href',function(i,str){
    return str +'?v=1';
});
</script>
*/

Thanks for the reply Darryl, the first script didn't work for me but I modified it a bit to this:

/*

<script>$('.base_main_menu_index a').attr('href',function(i,str){    return str +'?v=1';});</script>

*/

 and it worked! Thanks a ton!

Yea. I didn't notice at first. When I pasted the code in the first time it ran parts together. I corrected it, and reposted. Glad it worked for you.